
public class test4 {

	public static void main(String args[])
	{
		int a = 1;
		int n = 5;
		
		while(a<n){
			int i = 1;
			while(i<=a){
				System.out.print(a);
				i++;
			}
			a++;
			System.out.println();
		}
	}
}



